Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests if ground is constantly being applied to the horn relay.
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The horn relay control circuit includes the horn brush slip ring and the horn switch. The horn brush slip ring and the horn switch must be tested for a short to ground when testing the relay control circuit.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you review the Horns operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Horns |
2 | Depress and release the horn switch. Are the horns on at all times? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Disconnect the horn relay. Are the horns on at all times? | Go to Step 7 | Go to Step 4 |
Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Does the test lamp illuminate? | Go to Step 6 | Go to Step 5 | |
5 | Inspect for poor connections at the horn relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
Test horn relay control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 | |
7 | Repair the short to voltage in the horn signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | -- |
8 | Repair the short to voltage in the horn control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 10 | -- |
9 | Replace the horn relay. Did you complete the replacement? | Go to Step 10 | -- |
10 | Operate the horns. Do the horns operate properly? | System OK | Go to Step 1 |
